I htink 2 middle names is fine in principle although your planned ones both starting with E and being fairly long make the whole name a bit long winded. woudl stick to one to be honest or perhaps change elizabeth to lizzie so differnt sounds/lenghts etc
I suspect that having more than one middle name is (in MN terminology) ponce-tastic or trying too hard. But who cares? I always wished I had two middle names - my only middle name being tres dull - so now my child has two middle names (and three more unofficial ones she has chosen for herself) plus a double barrelled surname.
My sister and I have two middle names, as do both her children. I have also planned 2 middle names for DC1 due in three weeks. When I run out of boxes on those forms, I just put Milly Molly M. Surname. I sometimes have to count the boxes first, but it's not a problem.
Mine both have 2 middle names done to use family names evenly. In practice the third name gets missed off anything official even though it's on the birth certs of both of them. I guess it's because the offishuls don't have enough little boxes on their computers/forms to fit all the names in.